Issue with forms

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Hi everyone

I am building a site on version 8,5.1. Whenever I try to insert a form, I get the following error message:

A managed+dirty entity Concrete\Core\Entity\Attribute\Key\Settings\TextSettings@00000000324b01b70000000020100d24 can not be scheduled for insertion.
Details
/usr/www/users/lazyrr/concrete5_2019/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/ORMInvalidArgumentException.php(37): Doctrine\ORM\ORMInvalidArgumentException->null   
/usr/www/users/lazyrr/concrete5_2019/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php(1212): Doctrine\ORM\ORMInvalidArgumentException->scheduleInsertForManagedEntity   
/usr/www/users/lazyrr/concrete5_2019/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php(911): Doctrine\ORM\UnitOfWork->scheduleForInsert   
/usr/www/users/lazyrr/concrete5_2019/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php(1867): Doctrine\ORM\UnitOfWork->persistNew   
/usr/www/users/lazyrr/concrete5_2019/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php(1786): Doctrine\ORM\UnitOfWork->doMerge   
/usr/www/users/lazyrr/concrete5_2019/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/EntityManager.php(667): Doctrine\ORM\UnitOfWork->merge   
/usr/www/users/lazyrr/concrete5_2019/concrete/blocks/express_form/controller.php(561): Doctrine\ORM\EntityManager->merge   
/usr/www/users/lazyrr/concrete5_2019/concrete/src/Entity/Block/BlockType/BlockType.php(674): Concrete\Block\ExpressForm\Controller->save   
/usr/www/users/lazyrr/concrete5_2019/concrete/src/Page/Collection/Collection.php(967): Concrete\Core\Entity\Block\BlockType\BlockType->add   
/usr/www/users/lazyrr/concrete5_2019/concrete/src/Page/Page.php(2715): Concrete\Core\Page\Collection\Collection->addBlock   
/usr/www/users/lazyrr/concrete5_2019/concrete/controllers/dialog/page/add_block.php(100): Concrete\Core\Page\Page->addBlock   
/usr/www/users/lazyrr/concrete5_2019/concrete/src/Controller/AbstractController.php(294): Concrete\Controller\Dialog\Page\AddBlock->submit   
/usr/www/users/lazyrr/concrete5_2019/concrete/src/Controller/AbstractController.php(294): null->call_user_func_array


Ideas anyone?

pixeljunkie